Dresden 2009 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 27: Superconductivity: Vortex Dynamics, Vortex Phases, Pinning
TT 27.4: Vortrag
Mittwoch, 25. März 2009, 14:45–15:00, HSZ 105
Observation of nanostripes and -clusters in NEG superconductors — •Michael R. Koblischka1, Marc Winter1, Pintu Das1, Anjela Koblischka-Veneva2, Miryala Muralidhar3, Thomas Wolf4, Nadendla Hari Babu5, Steve Turner6, Gustav van Tendeloo6, and Uwe Hartmann1 — 1Experimental Physics, Saarland University, Campus C 6 3, D-66123 Saarbrücken, Germany — 2Functional Materials, Saarland University, Campus C 6 3, D-66123 Saarbrücken, Germany — 3SRL/ ISTEC, 1-10-13, Shinonome, Koto-ku, Tokyo, 135-0062, Japan — 4Forschungszentrum Karlsruhe GmbH, Institute of Solid State Physics, D-76021 Karlsruhe, Germany — 5IRC in Superconductivity, University of Cambridge, Madingley Road, Cambridge, CB3 0HE, U. K. — 6EMAT Research Group, University of Antwerp, B- 2020 Antwerp, Belgium
Nanostripes are observed in melt-textured and single-crystalline samples of the ternary light rare earth (LRE) compound (Nd0.33Eu0.33Gd0.33)Ba2Cu3Ox (NEG) by means of atomic force microscopy, scanning tunnelling microscopy at ambient conditions, combined with TEM and electron backscatter diffraction. This enables the observation of several important features: Nanostripes are formed by chains of clusters, representing the LRE/Ba substitution. The periodicity of the nanostripes is found to range between 40 and 60 nm; the shape of the nanoclusters is elliptic with a major axis length between 300 and 500 nm and a minor axis length of about 30 to 150 nm. The dimensions of the nanostripes are similar for both types of NEG samples.